Hehe, I wasn't warning about boobs. And this warning is for you too Tim.
BO can change your lifetime hormonal makeup and it will produced estrogen primarily rather than testosterone. So, you'll femme completely.. hair, skin, fat, figure, emotions and even thinking. It is like going HRT and you'll have to deal with that (meaning visits to specialists from time to time for hormone checkup).
I am not suggesting this is bad but needs to be considered carefully. With my mild herbs, I'm seeing all of these effects to much milder forms but if BO actual works for you (not 100%) then you have barely 4-8 months before you can't stop due to panic.
I can share that I'm seriously thinking about this method but I have to answer the question about losing male functionality. Think long and hard about playing with this one is all I suggest.
DJ